Pakistan has been at the centre of both the activities of al-Qaeda and the struggle against it. The third part of Peter Taylor's series looks at the Pakistani authorites and their battle against the new al-Qaeda. Thousands of soldiers have been deployed in the remote mountain borders with Afghanistan while the country's security services are trawling for intelligence in the cities.

Pakistan has captured more al-Qaeda suspects than any other country, including some of its most senior leaders.

Now for the first time intelligence agents and military leaders reveal some of the secrets about the arrests and the battle against extremists on the remote border with Afghanistan, where many believe Osama Bin Laden is hiding.

The head of the country's Counter Terrorism Centre speaks for the first time about the interrogations of more than 500 suspects including the man he describes as the third most important al-Qaeda figure.

And in the programme President Musharraf also defends his country's record against allegations that his intelligence agencies helped establish the Taleban and have been reluctant to bring Bin Laden into custody.

The New Al-Qaeda: Frontline Pakistan was shown on Monday 8 August 2005 at 2100BST on BBC Two.